1. Lesson 7-9 Precision and Significant Digits

2. Definitions Precision- a measure of exactness to which a measurement is made. Precision depends on the smallest unit of measure being used, or the precision unit. Significant Digits- All the digits that are actually measured plus one estimated digit. Significant digits indicate the precision of the measurement.

3. Identify the precision unit of the thermometer. -10 0 10 20 30 40 50 60 70 80 90 100 110 120

4. Determine the number of significant digits in each measure. 5,000 ft 315.05 oz

5. Find each sum or difference using the correct precision. 45 in. + 12.7 in. 7.38m – 5.9m

6. Find each product or quotient using the correct number of significant digits.